人教版高二英语选修7第二单元语法课件ppt80829复习过程.ppt

Unit 2 Grammar Discovering useful structures Go over the passive voice My hamburger was eaten by the dog. A new hospital will be built in our city. 被动语态由be+过去分词构成，be随时态的变化而变化。 一般现在时：am/is/are + P.P The classroom is cleaned .　　 一、被动语态的构成 一般过去时：was/were + p.p These computers were made in our own country. 一般将来时：will/shall be + p.p Shall we be asked to attend the opening ceremony? 　 过去将来时：would be + p.p The news would be sent to the soldier's mother as soon as it arrived. 现在进行时：am/is/are being +p.p　 Trees are being planted over there by them. 过去进行时：was/were being + p.p The feast was being prepared when the birds arrived in the sky. 现在完成时：have/has been +p.p Swift progress has also been made in culture and education. 过去完成时：had been + p.p The huge bridge had been damaged before the World War II. 　　 将来完成时：will/shall have been +p.p The book will have been published by the end of next month. 含有情态动词的动词变成被动语态：情态动词 + be + 过去分词 This problem can be solved. 这问题可解决。 What’s done cannot be undone. 覆水难收。 二、动词不定式的被动语态 一般时 to be done 完成时 to have been done I perfer to be left at home rather than go shopping. The river is reported to have been polluted. 1. The dishes need 2. The mail needs right away. wash send to be washed. to be sent 三、不定式的主动形式表示被动 1. 在there be结构中。There is a lot of homework to do. (也可用to be done) There is no time to lose (to be lost). 2. 在“n.／pron + be + adj. + to do”结构中。常用的形容词有easy，difficult，hard，impossible，nice，pleasant，light，heavy，interesting，important，expensive，cheap，fit，dangerous等。 He is hard to convince. 3. 在“too … to do; enough … to …”结构中。如： The problem is too difficult to work out (to be worked out). The house is big enough to live in. 4. 在“with + n. + to do”结构中。With nothing to do, he lay in bed.With so many exercises to do, I can’t go to the cinema. 5. 一些作表语用的不定式的主动形式。 常见的这类动词有let (出租), rent， hire, blame等。 The house is to let.I felt I was to blame.